Lacuna UK and Ireland | Testing for u-values, security, airtightness and water tightness
The Lacuna bi-fold doors have undergone thorough testing at the Danish Technological Institute ( and at the ift Rosenheim (
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Lacuna A/S thrive to have the most ‘up-to-date’ product of high quality and are therefore always looking to improve the specifications. As part of this on-going development process the bi-fold doors regularly undergo thorough testing for different aspects.


The bi-fold doors have been tested at the Danish Technological Institute ( and at the ift Rosenheim (, and the various certificates in regards to u-values, security, airtightness and water tightness are listed below. An Environmental Product Declaration is also included.


Lacuna A/S also do their own ‘in-house’ tests to monitor performance and one of them is the water test’ to make sure that the heat treated wood lives up to the expected Lacuna quality.


If you require further information regarding Lacuna’s specifications or tests please contact us and we would be happy to help.